1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___ALGORITHM_RANGES_PREV_PERMUTATION_H 10 #define _LIBCPP___ALGORITHM_RANGES_PREV_PERMUTATION_H 11 12 #include <__algorithm/in_found_result.h> 13 #include <__algorithm/iterator_operations.h> 14 #include <__algorithm/make_projected.h> 15 #include <__algorithm/prev_permutation.h> 16 #include <__config> 17 #include <__functional/identity.h> 18 #include <__functional/ranges_operations.h> 19 #include <__iterator/concepts.h> 20 #include <__iterator/sortable.h> 21 #include <__ranges/access.h> 22 #include <__ranges/concepts.h> 23 #include <__ranges/dangling.h> 24 #include <__utility/move.h> 25 #include <__utility/pair.h> 26 27 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 28 # pragma GCC system_header 29 #endif 30 31 _LIBCPP_PUSH_MACROS 32 #include <__undef_macros> 33 34 #if _LIBCPP_STD_VER >= 20 35 36 _LIBCPP_BEGIN_NAMESPACE_STD 37 38 namespace ranges { 39 40 template <class _InIter> 41 using prev_permutation_result = in_found_result<_InIter>; 42 43 struct __prev_permutation { 44 template <bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent, class _Comp = ranges::less, class _Proj = identity> 45 requires sortable<_Iter, _Comp, _Proj> 46 _LIBCPP_HIDE_FROM_ABI constexpr prev_permutation_result<_Iter> 47 operator()(_Iter __first, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const { 48 auto __result = std::__prev_permutation<_RangeAlgPolicy>( 49 std::move(__first), std::move(__last), std::__make_projected(__comp, __proj)); 50 return {std::move(__result.first), std::move(__result.second)}; 51 } 52 53 template <bidirectional_range _Range, class _Comp = ranges::less, class _Proj = identity> 54 requires sortable<iterator_t<_Range>, _Comp, _Proj> 55 _LIBCPP_HIDE_FROM_ABI constexpr prev_permutation_result<borrowed_iterator_t<_Range>> 56 operator()(_Range&& __range, _Comp __comp = {}, _Proj __proj = {}) const { 57 auto __result = std::__prev_permutation<_RangeAlgPolicy>( 58 ranges::begin(__range), ranges::end(__range), std::__make_projected(__comp, __proj)); 59 return {std::move(__result.first), std::move(__result.second)}; 60 } 61 }; 62 63 inline namespace __cpo { 64 constexpr inline auto prev_permutation = __prev_permutation{}; 65 } // namespace __cpo 66 } // namespace ranges 67 68 _LIBCPP_END_NAMESPACE_STD 69 70 #endif // _LIBCPP_STD_VER >= 20 71 72 _LIBCPP_POP_MACROS 73 74 #endif // _LIBCPP___ALGORITHM_RANGES_PREV_PERMUTATION_H 75